proportion
noun
comparative relation between things or magnitudes as to size, quantity, number, etc.; ratio.
Used to express actions, events, or states that have not yet occurred but are expected to happen.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
The operator will proportion the coating of iodine and bromine or accelerators according to the strength and composition of the latter.
From American Hand Book of the Daguerreotype by Humphrey, S. D. (Samuel Dwight)